project-base/server-skynet-source-3rd-jemalloc
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Attempt mmap-based in-place huge reallocation.

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Attempt mmap-based in-place huge reallocation by plumbing new_addr into
chunk_alloc_mmap().  This can dramatically speed up incremental huge
reallocation.

This resolves #335.
This commit is contained in:
Jason Evans 2016-02-24 17:18:44 -08:00
parent 5ec703dd33
commit c7a9a6c86b
3 changed files with 12 additions and 13 deletions
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4
include/jemalloc/internal/chunk_mmap.h
View File

@ -9,8 +9,8 @@
/******************************************************************************/
#ifdef JEMALLOC_H_EXTERNS
void *chunk_alloc_mmap(size_t size, size_t alignment, bool *zero,
bool *commit);
void *chunk_alloc_mmap(void *new_addr, size_t size, size_t alignment,
bool *zero, bool *commit);
bool chunk_dalloc_mmap(void *chunk, size_t size);
#endif /* JEMALLOC_H_EXTERNS */

11
src/chunk.c
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@ -350,12 +350,9 @@ chunk_alloc_core(arena_t *arena, void *new_addr, size_t size, size_t alignment,
chunk_alloc_dss(arena, new_addr, size, alignment, zero, commit)) !=
NULL)
return (ret);
/*
* mmap. Requesting an address is not implemented for
* chunk_alloc_mmap(), so only call it if (new_addr == NULL).
*/
if (new_addr == NULL && (ret = chunk_alloc_mmap(size, alignment, zero,
commit)) != NULL)
/* mmap. */
if ((ret = chunk_alloc_mmap(new_addr, size, alignment, zero, commit)) !=
NULL)
return (ret);
/* "secondary" dss. */
if (have_dss && dss_prec == dss_prec_secondary && (ret =
@ -380,7 +377,7 @@ chunk_alloc_base(size_t size)
*/
zero = true;
commit = true;
ret = chunk_alloc_mmap(size, chunksize, &zero, &commit);
ret = chunk_alloc_mmap(NULL, size, chunksize, &zero, &commit);
if (ret == NULL)
return (NULL);
if (config_valgrind)

10
src/chunk_mmap.c
View File

@ -32,7 +32,8 @@ chunk_alloc_mmap_slow(size_t size, size_t alignment, bool *zero, bool *commit)
}
void *
chunk_alloc_mmap(size_t size, size_t alignment, bool *zero, bool *commit)
chunk_alloc_mmap(void *new_addr, size_t size, size_t alignment, bool *zero,
bool *commit)
{
void *ret;
size_t offset;
@ -53,9 +54,10 @@ chunk_alloc_mmap(size_t size, size_t alignment, bool *zero, bool *commit)
assert(alignment != 0);
assert((alignment & chunksize_mask) == 0);
ret = pages_map(NULL, size);
if (ret == NULL)
return (NULL);
ret = pages_map(new_addr, size);
if (ret == NULL || ret == new_addr)
return (ret);
assert(new_addr == NULL);
offset = ALIGNMENT_ADDR2OFFSET(ret, alignment);
if (offset != 0) {
pages_unmap(ret, size);